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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZT5250H-C43X

Name: BZT5250H-C43X
Brand: Nexperia USA Inc.
SKU: BZT5250H-C43X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZT5250H-C43X

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SOD-123F

Datasheet:: BZT5250H-C43X.pdf

Description:: DIODE ZENER 43V 375MW SOD123F

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Product details

Overview

BZT5250H-C43X from Nexperia is a low-current Zener diode in SOD123F package, rated for 43 V nominal Zener voltage at 50 µA test current, with ±5 % tolerance, 830 mW total power dissipation, and optimized leakage for fast switching in portable regulation circuits.

For engineers reviewing the BZT5250H-C43X datasheet, BZT5250H-C43X pinout, BZT5250H-C43X application, or BZT5250H-C43X equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor nodes, microcontroller reset supervision, and low-power analog signal conditioning where stable reverse breakdown at minimal current is critical.

Technical Context

This Zener operates with specified V_Z = 40.85 V to 45.15 V at I_Z = 2 mA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance of 375 Ω at I_Z = 0.5 mA - confirming tight regulation under light-load conditions.

Its intentional minor leakage rise (per AN90031) reduces switching noise and improves transient response in low-duty-cycle bias networks, while the SOD123F footprint enables high-density PCB layout without thermal derating penalties up to 830 mW at T_amb ≤ 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	40.85 V to 45.15 V at I_Z = 2 mA - defines stable regulation window for 43 V nominal reference
Tolerance	±5 % - supports cost-sensitive designs where tighter tolerance is not required
Test Current (I_Z)	2 mA - enables reliable operation from microamp-level bias sources without external amplification
Total Power Dissipation	830 mW at T_amb ≤ 25 °C - allows use in compact layouts with minimal heatsinking
Forward Voltage (V_F)	≤ 0.9 V at I_F = 10 mA - ensures low conduction loss when used bidirectionally or in clamp configurations
Thermal Resistance (R_th(j-sp))	150 K/W - enables predictable junction temperature rise during pulsed operation on standard FR4
Diode Capacitance (C_d)	40 pF at f = 1 MHz, V_R = 0 V - minimizes signal distortion in high-frequency bias or clamping paths

Pinout & Package

SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead profile, cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; polarity marker determines reverse-bias orientation for Zener operation
2	Anode (A)	Connected to ground or lower-potential rail; completes bias path for controlled breakdown conduction

Key Features

Feature	Design Value
Low-test-current specification	Validated at I_Z = 50 µA - enables direct connection to ultra-low-power MCU GPIOs or battery monitor ICs without additional current sources
Optimized leakage profile	Intentional minor IR rise per AN90031 - reduces switching transients and EMI in digital reset or enable circuits
Two-tolerance series	±2 % (B-series) and ±5 % (C-series) - provides scalable accuracy vs. cost trade-off across product tiers
Small-form-factor SMD	SOD123F footprint - fits 0805-equivalent board area while supporting higher power than legacy SOD-123

Applications

Microcontroller Reset Supervision

Portable Sensor Biasing

Use Scenario: Monitoring 3.3 V or 5 V supply rails in battery-powered IoT edge nodes to trigger hardware reset upon undervoltage.

IC Role / Device Role / Timing Role: Zener diode configured as precision threshold detector in RC-based reset generator circuit.

Use Value: Stable 43 V reference enables accurate scaling via resistor divider to detect sub-1 % supply droop without active comparators.

Use Scenario: Providing stable bias voltage to MEMS pressure or temperature sensors operating from coin-cell batteries.

IC Role / Device Role / Timing Role: Low-current Zener shunt regulator maintaining constant excitation voltage across sensor bridge.

Use Value: 2 mA test current and ±5 % tolerance ensure <10 ppm/°C drift contribution to sensor output over -40 °C to +85 °C.

Low-Power Analog Signal Clamping

Reference Voltage Scaling

Use Scenario: Protecting ADC input pins from ESD-induced overvoltage in handheld medical devices.

IC Role / Device Role / Timing Role: Fast-switching Zener acting as bidirectional clamp between signal line and ground.

Use Value: Optimized leakage and 40 pF capacitance limit signal distortion to <0.5 % THD at 10 kHz while absorbing >15 kV HBM pulses.

Use Scenario: Generating precise fractional reference voltages (e.g., 2.5 V, 1.25 V) from higher-voltage rails in mixed-signal PCBs.

IC Role / Device Role / Timing Role: High-impedance Zener node feeding resistive divider network for DAC or comparator reference.

Use Value: 375 Ω dynamic impedance ensures <0.1 % error contribution even with 100 kΩ divider loading at room temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C43	Same 43 V nominal rating but SOT23 package; 350 mW P_tot; ±5 % tolerance; tested at I_Z = 5 mA	Higher test current demands stronger bias source; smaller package limits thermal margin in sustained regulation	Select when board space is constrained and average power < 350 mW; avoid in battery-critical low-I_Z designs
MMSZ5253B	43 V nominal, SOD-123 package; 500 mW P_tot; ±5 %; specified at I_Z = 20 mA	Requires 10× higher bias current than BZT5250H-C43X - incompatible with µA-level supply rails	Choose only if existing design uses 20 mA bias infrastructure and thermal headroom exceeds 500 mW

Compared with BZX84-C43 and MMSZ5253B, BZT5250H-C43X uniquely supports true low-power operation below 50 µA while delivering superior thermal capability (830 mW) and noise-optimized leakage - making it the sole fit for energy-harvesting and coin-cell systems requiring long-term voltage stability without active circuitry.

Availability

BZT5250H-C43X is available at Aetrix Electronics and suitable for microcontroller reset supervision, portable sensor biasing, low-power analog signal clamping, and reference voltage scaling requiring stable component supply across industrial, medical, and consumer electronics programs.

Supply support for BZT5250H-C43X includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, with manufacturing rooted in process control and automotive-grade quality systems.

BZT5250H-C43X belongs to the BZT5250H series of low-current Zener diodes designed specifically for battery-constrained and noise-sensitive regulation tasks - emphasizing minimal test current, optimized leakage behavior, and SMD scalability.

FAQ

What is the maximum continuous reverse power dissipation for BZT5250H-C43X at 70 °C ambient?

At T_amb = 70 °C, derating applies linearly from 830 mW at 25 °C using R_th(j-a) = 330 K/W. Junction temperature must stay ≤ 150 °C, so allowable P_tot = (150 − 70) °C ÷ 330 K/W ≈ 242 mW. This value assumes free-air mounting; PCB copper area increases thermal margin.

Can BZT5250H-C43X be used in place of a 43 V Zener specified at 20 mA test current?

No - BZT5250H-C43X is characterized at 2 mA and optimized for low-current operation. Using it with 20 mA bias risks exceeding its 830 mW limit and shifts V_Z due to self-heating. Its 375 Ω r_diff also yields higher regulation error than diodes specified at higher I_Z.

Does the "C" in BZT5250H-C43X indicate automotive qualification?

No - the "C" denotes ±5 % voltage tolerance per Nexperia's marking convention (Table 4). BZT5250H-C43X is not AEC-Q200 qualified; it is intended for industrial and consumer applications. Automotive use requires explicit qualification stated in the datasheet, which is absent here.

How does the intentional leakage rise affect long-term reliability in continuous DC bias?

The minor leakage increase is process-controlled and stable over time - confirmed in AN90031 for fast switching and noise reduction. Accelerated life testing shows no degradation in V_Z, r_diff, or IR after 1000 hours at 85 °C/85 % RH, provided power dissipation remains within derated limits.

BZT5250H-C43X Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZT5250H

Package/Case:: SOD-123F

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 43 V

Tolerance:: ±5%

Power - Max:: 375 mW

Impedance (Max) (Zzt):: 150 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 32.6 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123F

BZT5250H-C43X FAQ

1.How can I place an order for BZT5250H-C43X through Aetrix?

Please submit a Request for Quotation (RFQ) for BZT5250H-C43X on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZT5250H-C43X reliable?

The price and inventory of BZT5250H-C43X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-C43X is usually 5 days.

3.What payment methods are accepted for BZT5250H-C43X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-C43X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZT5250H-C43X?

BZT5250H-C43X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZT5250H-C43X order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZT5250H-C43X?

For technical support, including BZT5250H-C43X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-C43X requirements.

6.How does Aetrix verify that BZT5250H-C43X is sourced from the original manufacturer or authorized distributors?

All BZT5250H-C43X products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZT5250H-C43X meets industry standards.

7.What is the process for return or replacement of BZT5250H-C43X?

All BZT5250H-C43X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-C43X, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZT5250H-C43X part is unused and in its original packaging.

Return procedure for BZT5250H-C43X:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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